When it comes to your business updating your website really matters, whether to update or redesign depends upon your business goals.
How often should you redesign your website? It depends. But it all comes down to your answer to the following questions.

If You Want More Customers Or Traffic

Maintaining traffic to your site is a tough task. You must have enough potential stuff on your website to maintain the regular traffic.

Redesigning your website can improve the SEO and content of your site can increase traffic which can make conversions.

If You Haven’t Met Your Goals

A unique web design and appropriate development can make you achieve your goals.
If your website is underperforming, it is probably a sign that your visitors are expecting more or something different from your site. It is your duty to find out what that is and update it.

If Your Website Is Malfunctioning

The website which works for you should be functioning very well. It must not experience crashing, “404” page not found, slow load time or virus attack.
Once if you come across these blunders, it is the truth that you must start redesigning your website.

If It’s Not Responsive

A recent survey says that 60% of traffic is now coming from mobile devices and tablets. If your web design is not built to display on a smaller screen of smartphones and tablets, in which you cannot afflict your visitor with a large screen size, then you must redesign your website.

If Your Website Is Too Slow

Your visitors have no patience to wait longer than 3-5 seconds on average for your website to load, or they will leave. Which may lead to losing a conversion. So it is important that your page is optimized and faster

If Your Competitors Updated Their Website

You may need to upgrade to the trend. If your website afflicts the visitor and your competition is not, then definitely you’ll lose a business. Check for the trends and keep updating your website to rank higher before your competitor does it first.

If Your Site Isn’t Attractive

It is also important to remember that only people are going to give you business, not the computers. People like things which are attractive and if your site is a mess or disorganized you might lose visitors.

If You Aren’t Using HTTPS

Websites handle secure information nowadays. It’s becoming increasingly important that every site uses HTTPS for SEO which increases the page speed, user perception, and security.
To use HTTPS it won’t require redoing your website, you just need to purchase an SSL certificate and set up 301 redirects.